I have run lots of 2 stroke gas engines on chainsaws, weed -wackers, etc, etc. The small engines of today work well on 50 to one mix and thats all I use in any of them. Buy only oil from well known Manufacturers who make quality products.
I use the higher octane gas mixing a gal. at a time as it is usually a lot fresher and I also buy oil in containers that mix a gallon at a time so no mix-up on rates.
Auto oil is a very poor choice and has not been done for years.
I have had quite a number of large pro saws and they have all run well on good 50 to 1, working them as hard as I could in extreme heat.